Answer this question truthfully
### Question: What causes Hyperventilation syndrome?
### Response: Anxiety and nervousness Bleeding Cardiac disease, such as congestive heart failure or heart attack Drugs (such as an aspirin overdose) Infection such as pneumonia or sepsis Ketoacidosis and similar medical conditions Lung disease such as asthma, chronic obstructive pulmonary disease (COPD), or pulmonary embolism Panic attack Pregnancy Severe pain Situations where there is a psychological advantage in having a sudden, dramatic illness (for example, somatization disorder) Stimulant use Stress